89 lines
1.4 KiB
C++
89 lines
1.4 KiB
C++
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//TLE 30
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#include<bits/stdc++.h>
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using namespace std;
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#define int long long
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const int MAX_N =5e6+5;
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int binExp(int b,int e,int p){
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int r=1;
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while(e>0){
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if(e%2==1)r=(r*b)%p;
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b=(b*b)%p;
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e=e>>1;
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}
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return r;
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}
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int inverse(int b,int p){
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return binExp(b, p-2,p);
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}
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#ifdef OITEST
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#endif
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#ifndef OITEST
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#endif
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#ifndef OITEST
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int read(){
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int x=0,w=1;
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char ch=0;
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while(!isdigit(ch)){
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if(ch=='-')w=-1;
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ch=getchar();
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}
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while(isdigit(ch)){
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x=x*10+(ch-'0');
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ch=getchar();
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}
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return x*w;
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}
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#endif
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signed main(signed argc,char *argv[]){
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ios::sync_with_stdio(false);
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cin.tie(0);
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#ifdef OITEST
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assert(argc==3);
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cout<<argv[1]<<endl<<argv[2]<<endl;
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ifstream ifile(argv[1]);
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ifstream afile(argv[2]);
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assert(ifile.is_open()&&afile.is_open()==true);
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stringstream ss;
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#define cin ifile
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#define cout ss
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#endif
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int n,p,k;
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#ifdef OITEST
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cin>>n>>p>>k;
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#endif
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#ifndef OITEST
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n=read();
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p=read();
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k=read();
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#endif
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int ans=0;
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int kp=k;
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for(int i=1;i<=n;i++){
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int a;
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#ifdef OITEST
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cin>>a;
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#endif
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#ifndef OITEST
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a=read();
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#endif
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ans=((int)(kp*inverse(a, p))%p+ans)%p;
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kp=(kp*k)%p;
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}
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cout<<ans<<endl;
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#ifdef OITEST
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int my,anser;
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cout>>my;
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afile>>anser;
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assert(my==anser);
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#endif
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}
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